These 12" x 16" pads are made of an open cell foam to hold hooks securely. The clear plastic cover is made of a UV resistant material so your lures won't fade out in the sun. The plastic cover is heavy enough that accidentally leaning against the pad will not result in a treble hook impalement or worse. Your lures won't get banged around or chipped up as when you toss them into ordinary tackle boxes. We field tested these pads and found them to be superior to other storage systems.